Through the modal test and finite element simulation of the carbon fiber epoxy resin/Nomex paper honeycomb

panel which is one-side stepped scarf patch repaired, the vibration characteristics of the scarf patch repaired

composite honeycomb panel (abbreviated as honeycomb repaired panel) under hygrothermal conditions were

explored. Using the segmented shear deformation theory and the hygrothermal equivalent theory, a finite element

model for one-side stepped scarf patch honeycomb repaired panel was established. The effect of repairing parameters on the natural frequency of honeycomb repaired panel under different hygrothermal conditions was analyzed. The results showed that the stiffness of the composite honeycomb panels decreases due to scarf patch repairing, and the smaller the slope of scarf patch, the more the motherboard is removed, the lower the stiffness of

the honeycomb panels, and the effect is more significant under hygrothermal conditions. In the range of temperature from 300 K to 375 K and humidity from 0 to 0.75%, the natural frequency of honeycomb repaired panels decreases more significantly in hygroscopic conditions than that in thermal conditions. The combined effect of hygrothermal has a greater impact on the natural frequency reduction of honeycomb repaired panels than superposition of the separate effects of hygroscopic and thermal conditions.

composite honeycomb panel, scarf patch repair, repairing parameter, hygrothermal conditions, vibration char－